[pom] Update mockito core to 2.27.0

Author: hazendaz

pom.xml

@@ -223,7 +223,7 @@
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>
-      <version>2.23.4</version>
+      <version>2.27.0</version>
       <scope>test</scope>
     </dependency>